Hi Jaime, Joerg and All,
Thanks for the explaining. In all those years I've never actually seen this, quite
surprising actually :). In this case the comments field was empty and indeed not set. As
it could be filled during the proces I'll be adding an empty string to the field. I still
need to update it with additional text.
Best regards,
Almar van Pel
www.makeweb.nl
-----Original Message-----
From: Jaime Crespo Rincón [mailto:jcrespo@stripped]
Sent: dinsdag 22 februari 2011 13:20
To: Joerg Bruehe
Cc: mysql@stripped; Almar van Pel
Subject: Re: contact gives empty result
2011/2/22 Joerg Bruehe <joerg.bruehe@stripped>:
> You have not understood the concept of NULL in SQL:
> NULL does not mean "empty", it means "unknown".
[...]
Apart form fully agreeing with Joerg, just a tip:
you can use the the IFNULL() operand as a workaround:
<http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html#function_ifnull>
Anyway, you should get rid of misplaced NULL fields, as they also
affect performance.
--
Jaime Crespo
MySQL & Java Instructor
Software Developer
Warp Networks
<http://warp.es>
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